Method of making fiber insulating-linings for incandescent-lamp sockets.



No. 735,778. "PATENTED AUG. 11, 1903.

- 0. 3. KENNEY. METHOD OF MAKING FIBER INSULATING LININGS FORINGANDESGENT LAMP SOCKETS. APPLICATION FILED DBO. a1, 1902.

H l I I lllllllHl UNITED STATES Patented August 11, 1903.

PATENT OFFIC V OWEN E. KENNEY, OF TOLEDO, OHIO, ASSIGNOR. TO THE YOSTELECTRIC MANUFACTURING COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO.

METHOD OF MAKING FIBER INSULAIING-LININGS FOR lNCAN DESCENT-LAMPSOCKETS.-

SPECIFICATION forming part Of LetteIS Patent NO. 735,778, dated August 11, 1903.

Application filed December 31, 1902. Serial No. 137,337. (No model.)

10 such as will enable others skilled in the art to which it appertainsto make and use the same. v

My inventionrelates to a certain new and useful method of manufacturinginsulating I 5 linings for the interior of the ordinary brass shellwhich constitutes the cover or case for incandescent lamp sockets.quirements of the trade and the demands of the underwriters it isrequired that these liliings shall be so arranged within the brass shellas to constitute a perfect insulation and at the same time to be readilyseparable from the brass shell when desired.v As a result of theordinary method of manufacturing con- 2 5 tinuous or tubular liningsfrom the material known in the trade as fiber f the said linings whenfirst placed within the shell at the place of manufacture are readilyremovable therefrom, but when shipped to various destinao tions it hasbeen found that, owing to lapse of time and varying atmosphericconditions, supplemented by the rough or 'crimped condition of the fiberresulting from the reduction of diameter of the tube' at one locale 3 5ity, said lining adheres so tenaciously to the brass shell as to renderit difficult and frequently impossible to separate it therefrom withoutdestroying the integrity of the lining. To avoid this difficulty, it hasbeen suggested 40 to construct a tubular lining from a fiat sheet and toso cut or shape the blank that when rolled into the required tubularform the necessary different diameters may be secured without crimpingor corrugating the fiber.

Instances of this method of manufacture are found in Letters Patent Nos.(326,927 and 692,700; but while structures so made avoid the crimping orcorrugations referred to the vertical edges of the blank when rolledinto tubular form are held in contact by the sur- Under there roundingbrass shell or cover, and as a consequence the degree of contact isVariable ac cording to the variability of the diameter of the fibertubing and the inclosing brass shell, and hence the perfection ofinsulation is dependent upon relation that the adjacent edges oftheinsulating-lining bear to each other.

My invention has for its object to produce a fiber insulating-lining ofcontinuous or integral construction which shall be free from crimps orcorrugations and which shall be unaffected by atmospheric conditions,and hence constitute a perfect and reliable insulation and unvariable inits relation with the surrounding brass shell or. cover.

With these ends in view my invention consists in the method ofmanufacture which I will now describe, referringby letters to theaccompanying drawings, in' which Figure 1 represents in perspective atubular blank or section cut from an ordinary tube of fiber. Fig. 2 is acentral vertical section of the same. Fig. 3 is a similar section withthe lining secured in properrelation with the surrounding and protectingshell or cover composed of sheet-brass; and Fig. 4is a central verticalsection showing a male and female die and a heating device for thelatter such as I preferably employ in my improved method of manufactureand showing in dotted lines the section or blank illustrated at Fig. 1arranged upon the male die and in position to be acted upon by thefemale die.

Similar letters of reference denote likeparts in the several figures ofthe drawings.

In manufacturing my improved insulator or lining I first cut from a tubeof fiber having a diameter approximating the larger diuppermost, so thatwhen it meets the reducing-shoulder B of the female die C it will not becrushed or broken, but will be gradually moved inwardly in an obviousmanner to reduce the diameter of the upper portion of the tubularsection or blank D. The male die may be secured by a screw-thread to anysuitable support or bed E and the female die to a reciprocating head F,provided with any suitable stripper or knock-out G. In suitable relationwith the reciprocating female die 0 is arranged, preferably, a gas-jetH, designed to heat the female die to about 150 Fahrenheit, so that whenthe blank D is subjected to the action of the dies A C the upper portionof the tubular blank D of fiber is reduced in diameter and under theaction of the heat of the female die the constituent elements or fibersof the blank are neither lengthened nor shortened, but are squeezed orcompressed together and vulcanized, as it were, so that the exteriorsurface of the thusreduced portion of the tubular blank D will be freefrom crimps or corrugation and present a smooth and compact surface bothexteriorly and interiorly. \Vhen the blank has been shaped between diesand under heat, as described, and removed by a suitable stripper orknock-out G or in any other manner, it is then placed in an oven andsubjected to a temperature of about 120 Fahrenheit for a period of aboutfive minutes to put it in a condition to readily absorb and attach toitself a lacquer solution, into which it is plunged or dipped while hotand immediately removed and set aside to cool and dry, and when socooled and dried the finished product will have perfectly smoothinterior and exterior surfaces and, being proof against moisture orother atmospheric influences, will retain the shape and proportionsgiven to it by the action of the forming-dies, and hence when properlyfitted within the brass shell at the locality of manufacture andproperly adjusted thereto may be readily removable from the shell at anyother locality or at any future time.

To prevent accidental separation of the lining from the brass shellduring transportation or necessary subsequent handling, the j lining maybe provided with two or more radial projections near the extremity ofits smaller diameter adapted to spring into the usual rib or bead formedin the corresponding part of the brassshell.

Having described my improved method of manufacture and the advantages tobe secured thereby, what I claim as new, and desire to secure by LettersPatent, is-

1. The method herein described of making fiber insulating-linings forincandescen t-lamp sockets which consists in cutting from a tube offiber sections of suitable length, with one edge at an angle of aboutforty-five degrees, then pressing said section into desired form betweendies and under a temperature of about 150 to compact and vulcanize thefiber, then baking the same for about five minutes in an oven at about120 Fahrenheit, and finally while in a heated state subjecting the sameto a bath of lacquer.

2. As a new article of manufacture, a fiber lining for incandescent-lampsockets compressed and vulcanized into desired form and impregnated andcoated with lacquer, substantially as hereinbefore set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

OWEN E. KENNEY.

Witnesses:

Jos. L. Yosr, MARGUERITE A. ELY.

